Multiple-times injection oil quantity compensation method and multiple-times injection oil quantity compensation device

Abstract

The present invention provides a method and device for compensating the amount of fuel injected by multiple injections, which can solve the problems caused by using the existing oil amount fluctuation compensation model compensation when the engine works in the fuel injection mode of multiple (more than two) injections. In order to solve the problem of large difference in quantity, it can accurately compensate the quantity of fuel injected each time in the working cycle of the engine, so that the actual quantity of injected fuel is close to the target value given by the ECU, so as to ensure the stability of the engine torque output and the emission of the engine characteristic. The method includes: determining the first corrected oil quantity of the i-th injection to the i+2-th injection and the second corrected oil quantity of the i+1-th injection to the i+2-th injection, wherein i is taken as All integers between 1 and N-2, N is the number of injections of the injector in one working cycle of the engine; according to the first corrected oil quantity and the second corrected oil quantity, the i+2th The target oil quantity injected is compensated. The invention is applicable to the technical field of engine control.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to a method and device for compensating multiple injection fuel quantities. Background technique [0002] Currently, in order to reduce engine emissions of particles (Particulate Matter, PM) and nitrogen oxides (NO x ), which introduces a multiple-injection fuel injection method, that is, the fuel injected into the combustion chamber is divided into two or more injections from one injection within one working cycle of the engine. [0003] In order to ensure the power, economy and low emission requirements of the engine, it is necessary to precisely control the amount of fuel injected each time. However, when the previous injection is performed, the fuel outlet of the injector control chamber will be opened, and when the previous injection is completed, the fuel outlet of the fuel injector control chamber will be closed quickly, so that when connecting the fuel rail and the f...

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for compensating the quantity of fuel injected multiple times, to at least solve the problem of using the existing fuel quantity fluctuation compensation model to compensate when the engine works under the fuel injection mode of multiple (more than two) injections. The problem caused by the large difference in oil quantity can accurately compensate the oil quantity of each injection in the engine working cycle, so that the actual injected oil quantity is close to the target value given by the ECU, so as to ensure the stability of the engine torque output and engine emission characteristics

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